Heat exchanger for evaporative cooling of air

The invention relates to heat exchangers air evaporative direct contact cooling gas and the coolant. Heat exchangers of this type are widely used in various technical fields, which require cooling and humidification.

Known heat exchangers for evaporative cooling of air, comprising a housing with end caps gratings, the space between them is filled with a hydrophilic material, and formed in the latter channels for passage of cooling air. The hydrophilic material is divided rigid transverse plate provided on the periphery of the support rings into sections, each of which is formed as a stack of perforated sheets, such as cardboard.

There are also such heat exchangers having a lower housing portion between the end bars sealed liquid chamber communicating with the hydrophilic material through vertical pipes having a cut at the bottom end adjacent to the housing, and through a grid, located on the upstream side of cooling air conducted tube one end of which is placed above the compartment and counter air flow, and the other put into the bay; cover the bottom of the front end face grille situated side of the cooling air, provided with a filling nipple, and at the top after grating disposed on the exit side of air hole communicating with the environment, the tube end situated in the liquid compartment, in top of the horizontal section of the overflow hole.

The disadvantages of these heat exchangers are few resources of their work, determined by the number of seasoned liquid, low heat exchange efficiency due to the uneven distribution of the liquid by cooling the surface, as they work in the main channel located closer to the liquid compartment, as well as high operational costs associated with assembly and removing the product from the facility when it is filling with fluid.

The achievable technical result is the invention to provide an efficient heat transfer along with humidification to constantly maintain water content, lower operating costs.

This result is achieved by that a heat exchanger for evaporative cooling, comprising a housing with end caps bars in the upper part, the space between them is filled package perforated sheet of rigid hydrophilic material with through channels for the passage of air and located in the lower housing portion a fluid chamber with a filling fitting and a device for supplying water to the package perforated sheets on filler connector is mounted vertically movable float located in the central part of the liquid chamber, and a device for supplying water to the package perforated sheets made as placed on the periphery of the compartment of the vertical and horizontal sections of a hydrophilic material, the latter being in contact with the package perforated sheets, made into the mantle of the same hydrophilic material, wherein the casing further comprises an overflow chamber having a ceiling section of the hydrophilic material in contact with the package of perforated sheets, said chamber has a common wall and a bottom liquid compartment and connected to it by a window in the lower portion of the common wall, and is provided at the top with an overflow fitting, and the bottom drain, wherein the float is formed with an internal bore, a filling nipple is axially float to form an annular gap between it and the inner surface float, thus fitting plugged with the upper end and has at the top of the perforations, and on the outer surface in the area of ​​the perforations provided storage chamber having a drain hole in the bottom, connected to said gap, wherein a float is arranged to overlap the bottom of said gap in the lower position float, with roof sections of the liquid chamber and overflow chamber are integrally formed from the same material, the material of the vertical and horizontal sections of the ceiling is formed with a lower hardness than the material of the perforated sheet of polyvinyl formal.

The drawing shows a heat exchanger for evaporative cooling.

The heat exchanger comprises a housing 1 consisting of two compartments 2 the upper and lower compartment 3. The top cover 4 has Mechanical between which the package is installed rigid perforated sheets of hydrophilic material 5 with through channels 6 for the passage of air, and the second compartment is made liquid section 7 with refueling connector 8 and the device 9 for supplying water to the package perforated sheets. On filler connector 8 is located in the central section of the liquid, the float 10 mounted for vertical movement.

A device for supplying water is designed as a vertical 11 and horizontal walls 12 and the shell 13. The vertical, horizontal wall and sides are made from the same hydrophilic material having lower rigidity than the material of the perforated sheet of polyvinyl formal.

The housing 1 is provided with a vertical partition 14 with an opening 15, an overflow 16 and a drain 17 fitting, wherein the partition is placed in the lower compartment between the cover and the vertical wall to form the chamber 18, the latter through a hole 15 communicated with the fluid section 7, and an overflow and discharge connections are arranged respectively the top and bottom parts of the chamber.

Float 10 is formed with a through hole mounted on the nozzle 8 to form a coaxial gap and the upper end of the nozzle is muffled, and has in the zone of said end of the perforation 19, the wall zone of the last is hollow to form a storage chamber 20, the bottom of which is provided with holes 21, through which chamber communicates with said clearance, wherein the float 10 is arranged to overlap the bottom of said gap in the lower position of the float.

The heat exchanger operates as follows.

Water under pressure through the filling nozzle 8 and perforations 19 enters the collection chamber 20 through the drain hole 21 the fluid enters the chamber 7, and at the same time through the holes 15 into the overflow chamber 18. As the liquid filling compartment float 10 rises. When the maximum water level float closes the opening 21 of the filling nozzle 8. When the flow of water in the process of heat and mass transfer float rises and opens the hole 21. In the case of uncovered holes 21 of the filling nozzle during filling with water the water level rises in the liquid compartment 7 at the same time in the overflow chamber 18 . Excess water is discharged through the nozzle 16.

When filling liquid compartment vertical wall and horizontal wall are impregnated with water, the water flows through the mantle 13 in the package moisturizes and perforated sheets 5 over their entire surface; air passing through the channels 6 packet exchanges heat and mass of the liquid, saturated to a relative humidity of about 85% evaporation of the liquid in the hydrophilic perforated sheets compensated by revenues from the fluid chamber through the vertical and horizontal walls and sides of water, the replenishment will occur continuously, regardless the evolution of the heat exchanger, since the vertical walls arranged around the entire circumference of the liquid chamber, and the package is fully enclosed in a shell of polyvinyl, providing a snug fit to the perforated sheet due to its expansion.

It designed and manufactured a prototype coil for evaporative cooling. Tests. According to test results established that the relative humidity at the outlet of the heat exchanger was 80-85% and is automatically maintained at this level; life was 10,000 hours, and the heat exchanger remains operational.